Flexible exercise device



FIG. 1 is a perspective view of the flexible exercise device;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof; and,

FIG. 6 is a side view thereof, the other side being a mirror image. 

The ornamental design for a flexible exercise device, as shown and described. 